在 p 標簽中添加 ul 時，Angular 模板解析錯誤

Question

我正在開發演示項目，如果我不在 P 標簽內添加 UL 標簽，則可以正常工作。

工作代碼：

<p>
<br/> Umesh test help <br/>
</p>
<ul>
<li *ngFor="let user of help2Listdata">
    <a routerLink="/details/{{user.hid}}">{{ user.hid }}</a>

    <ul>
        <li><a href="http://{{ user.name }}">{{ user.name }}</a></li>
        <li>{{ user.ans }}</li>
    </ul>
</li>
</ul> 

非工作代碼：

<p>
<br/> Umesh test help <br/>

<ul>
    <li *ngFor="let user of help2Listdata">
        <a routerLink="/details/{{user.hid}}">{{ user.hid }}</a>

        <ul>
            <li><a href="http://{{ user.name }}">{{ user.name }}</a></li>
            <li>{{ user.ans }}</li>
        </ul>
    </li>
</ul>
</p>

錯誤跟蹤：

ERROR Error: Uncaught (in promise): Error: Template parse errors:
Unexpected closing tag "p". It may happen when the tag has already been closed by another tag. For more info see https://www.w3.org/TR/html5/syntax.html#closing-elements-that-have-implied-end-tags ("
        </li>
    </ul>
[ERROR ->]</p>"): ng:///Help2Module/Help2Component.html@13:0
Error: Template parse errors:
Unexpected closing tag "p". It may happen when the tag has already been closed by another tag. For more info see https://www.w3.org/TR/html5/syntax.html#closing-elements-that-have-implied-end-tags ("
        </li>
    </ul>
[ERROR ->]</p>"): ng:///Help2Module/Help2Component.html@13:0
    at syntaxError (compiler.js:486)
    at DirectiveNormalizer.push../node_modules/@angular/compiler/esm5/compiler.js.DirectiveNormalizer._preparseLoadedTemplate (compiler.js:3222)
    at compiler.js:3202
    at Object.then (compiler.js:475)
    at DirectiveNormalizer.push../node_modules/@angular/compiler/esm5/compiler.js.DirectiveNormalizer._preParseTemplate (compiler.js:3202)
    at DirectiveNormalizer.push../node_modules/@angular/compiler/esm5/compiler.js.DirectiveNormalizer.normalizeTemplate (compiler.js:3180)
    at CompileMetadataResolver.push../node_modules/@angular/compiler/esm5/compiler.js.CompileMetadataResolver.loadDirectiveMetadata (compiler.js:14914)
    at compiler.js:34420
    at Array.forEach (<anonymous>)
    at compiler.js:34419
    at syntaxError (compiler.js:486)
    at DirectiveNormalizer.push../node_modules/@angular/compiler/esm5/compiler.js.DirectiveNormalizer._preparseLoadedTemplate (compiler.js:3222)
    at compiler.js:3202
    at Object.then (compiler.js:475)
    at DirectiveNormalizer.push../node_modules/@angular/compiler/esm5/compiler.js.DirectiveNormalizer._preParseTemplate (compiler.js:3202)
    at DirectiveNormalizer.push../node_modules/@angular/compiler/esm5/compiler.js.DirectiveNormalizer.normalizeTemplate (compiler.js:3180)
    at CompileMetadataResolver.push../node_modules/@angular/compiler/esm5/compiler.js.CompileMetadataResolver.loadDirectiveMetadata (compiler.js:14914)
    at compiler.js:34420
    at Array.forEach (<anonymous>)
    at compiler.js:34419
    at resolvePromise (zone.js:814)
    at resolvePromise (zone.js:771)
    at zone.js:873
    at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:421)
    at Object.onInvokeTask (core.js:4751)
    at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:420)
    at Zone.push../node_modules/zone.js/dist/zone.js.Zone.runTask (zone.js:188)
    at drainMicroTaskQueue (zone.js:595)

請讓我幫助理解為什么會遇到這個問題。 當我在檢查模式下看到工作代碼輸出時，它似乎很好，但是當更改標簽樹結構時，它會在瀏覽器控制台中拋出上述錯誤。

Answer 1

實際上，根據 w3c 規范，在 p 標簽內不允許使用 ul 標簽。 這將失敗。 嘗試使用其他標簽，例如 div 或 ng-content。

編輯：根據W3C 規范，p 標簽可以包含“短語元素”，這只能在以下標簽中：

a
em
strong
small
i
b